Cron Jobs and root emails

So the I have been checking the root email and I get this email daily about a cron job that is scheduled it is

Code:

run-parts /etc/cron.daily

And the email reads:

/etc/cron.daily/0logwatch:

Use of uninitialized value in numeric le (<=) at /etc/cron.daily/0logwatch line 683.
Use of uninitialized value in numeric le (<=) at /etc/cron.daily/0logwatch line 683.
Use of uninitialized value in numeric le (<=) at /etc/cron.daily/0logwatch line 683.
Use of uninitialized value in numeric le (<=) at /etc/cron.daily/0logwatch line 683.
Use of uninitialized value in numeric le (<=) at /etc/cron.daily/0logwatch line 683.